Wheel offset comparison

108 offset changes, each showing exactly how far the wheel moves and what it costs in clearance on either side.

Offset moves a wheel one millimetre per millimetre, so the maths is simple — but which direction you can afford depends on what is already tight. Pick a change below, or see the offset chart for the whole range at once.

Position change

Outer edge: —
Inner clearance: —
Track width: —

Positive outer movement means farther toward the arch. Positive inner clearance means more space from the inner rim edge, not proven suspension clearance.

How offset direction affects clearance
Change	Wheel moves	Arch clearance	Strut clearance
Lower ET number	Outward	Reduced	Increased
Higher ET number	Inward	Increased	Reduced

Worked example: 8J ET35 to 9J ET25

One extra inch of wheel width adds 25.4 mm, split evenly across both edges. Reducing offset by 10 mm then moves the whole wheel outward. The combined result is 22.7 mm more outer poke and 2.7 mm less inner clearance. Across an axle, the outer-edge track increases by 45.4 mm.

This geometry does not inspect brake calipers, suspension movement, hub bore, bolt pattern, load rating or bodywork. Measure both sides of the installed wheel and confirm hardware before buying.

Common questions

What happens when offset decreases?

With width unchanged, a lower positive offset moves the wheel outward by exactly the offset difference and creates the same amount of extra inner space.

Does wheel width affect the comparison?

Yes. Half of the width change is added to each side before the offset movement is applied.

Does this calculator guarantee fitment?

No. It compares declared geometry only. It cannot verify a vehicle, installation, load rating or physical clearance.

From ET0

ET0 vs ET10 ET0 vs ET15 ET0 vs ET20 ET0 vs ET25 ET0 vs ET30

From ET10

ET10 vs ET0 ET10 vs ET15 ET10 vs ET20 ET10 vs ET25 ET10 vs ET30 ET10 vs ET35 ET10 vs ET40

From ET15

ET15 vs ET0 ET15 vs ET10 ET15 vs ET20 ET15 vs ET25 ET15 vs ET30 ET15 vs ET35 ET15 vs ET40 ET15 vs ET45

From ET20

ET20 vs ET0 ET20 vs ET10 ET20 vs ET15 ET20 vs ET25 ET20 vs ET30 ET20 vs ET35 ET20 vs ET40 ET20 vs ET45 ET20 vs ET50

From ET25

ET25 vs ET0 ET25 vs ET10 ET25 vs ET15 ET25 vs ET20 ET25 vs ET30 ET25 vs ET35 ET25 vs ET40 ET25 vs ET45 ET25 vs ET50 ET25 vs ET55

From ET30

ET30 vs ET0 ET30 vs ET10 ET30 vs ET15 ET30 vs ET20 ET30 vs ET25 ET30 vs ET35 ET30 vs ET40 ET30 vs ET42 ET30 vs ET45 ET30 vs ET50 ET30 vs ET55 ET30 vs ET60

From ET35

ET35 vs ET10 ET35 vs ET15 ET35 vs ET20 ET35 vs ET25 ET35 vs ET30 ET35 vs ET40 ET35 vs ET45 ET35 vs ET50 ET35 vs ET55 ET35 vs ET60

From ET38

ET38 vs ET48 ET38 vs ET50

From ET40

ET40 vs ET10 ET40 vs ET15 ET40 vs ET20 ET40 vs ET25 ET40 vs ET30 ET40 vs ET35 ET40 vs ET45 ET40 vs ET50 ET40 vs ET55 ET40 vs ET60

From ET42

ET42 vs ET30

From ET45

ET45 vs ET15 ET45 vs ET20 ET45 vs ET25 ET45 vs ET30 ET45 vs ET35 ET45 vs ET40 ET45 vs ET50 ET45 vs ET55 ET45 vs ET60

From ET48

ET48 vs ET38 ET48 vs ET60

From ET50

ET50 vs ET20 ET50 vs ET25 ET50 vs ET30 ET50 vs ET35 ET50 vs ET38 ET50 vs ET40 ET50 vs ET45 ET50 vs ET55 ET50 vs ET60

From ET55

ET55 vs ET25 ET55 vs ET30 ET55 vs ET35 ET55 vs ET40 ET55 vs ET45 ET55 vs ET50 ET55 vs ET60

From ET60

ET60 vs ET30 ET60 vs ET35 ET60 vs ET40 ET60 vs ET45 ET60 vs ET48 ET60 vs ET50 ET60 vs ET55

How are these fitment figures calculated?

Fitment North calculates declared wheel and tyre geometry from the dimensions shown on the page, using the same tested method as the wheel-offset and tyre-size calculator. Tyre diameter uses rim diameter plus two calculated sidewalls; offset comparisons split width changes across inner and outer edges before applying the offset difference. Results are measurement aids, not vehicle approval. Confirm ratings, clearances and manufacturer guidance before fitting parts.